#include <fstream>
#define nmax 510

using namespace std;

ifstream fin("podm.in");
ofstream fout("podm.out");

int n;
long long int d[nmax];
long long int cmin[nmax][nmax];

void citire();
void pd();
void afisare();

int main()
{
    citire();
    pd();
    afisare();
    return 0;
}

void citire()
{
    int i;
    fin>>n;
    for(i=0;i<=n;i++)
        fin>>d[i];
}

void pd()
{
    int i,j,k,nr,minim;
    //inoitializare pt doua matrice
    for(i=1;i<n;i++)
        cmin[i][i+1]=d[i-1]*d[i]*d[i+1];
    for(nr=3;nr<=n;nr++)
    {
        //calculez costulpt toate secventele de nr matrice
        for(i=1;i<=n-nr+1;i++)
        {
            j=i+nr-1;
            minim=cmin[i+1][j]+d[i-1]*d[i]*d[j]; //pt k=i
            for(k=i+1;k<j;k++)
            {
                if(minim>cmin[i][k]+cmin[k+1][j]+d[i-1]*d[k]*d[j])
                    minim=cmin[i][k]+cmin[k+1][j]+d[i-1]*d[k]*d[j];
            }
            cmin[i][j]=minim;
        }
    }

}

void afisare()
{
    fout<< cmin[1][n] << '\n';
}